Javascript Typescript Type String Is - Latest Information & Updates 2026

Web Reference: Using the type predicate test is string in the above format (instead of just using boolean for the return type), after isString() is called, if the function returns true, TypeScript will narrow the type to string in any block guarded by a call to the function. Jan 16, 2026 · In this blog post, we will explore the fundamental concepts, usage methods, common practices, and best practices for checking if a string is of a specific type in TypeScript. JavaScript has three very commonly used primitives: string, number, and boolean. Each has a corresponding type in TypeScript. As you might expect, these are the same names you’d see if you used the JavaScript typeof operator on a value of those types: number is for numbers like 42.

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Last Updated: April 3, 2026

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